Sheet-metal pulley.



Patented Ian. 23, 1900.

No. 64!,83l.

E. G. BUDD.

SHEET METAL PULLEY.

(Application filed Jan. 27, 1899.)

2 Sheets-:Sheet I.

(No Model.)

n4: ucnms PETERS co PHOTD-LITNQ. WASHINGTON a. c,

N0. 64l,83|. Patented Ian. 23, I90Q. E. G. BUDD.

SHEET METAL PULLEY.

(Application filed. Jan. 27, 1899.) (No Model.) 2 Sheets-Sheet 2.

" NITED STATES PATENT OFFICE.

EDWARD G. BUDD, OF PHILADELPHIA, PENNSYLVANIA, ASSIGNOR TO THE AMERICAN PULLEY COMPANY, OF PENNSYLVANIA.

SHEET-METAL PU LLEY.

SPECIFICATION forming part of Letters Patent No. 641,831, dated January 23, 1900.

Application filed January 27, 1899. Serial No. 703,533. (No model.)

T 0 all whom, it may concern: 4

Be it known that I, EDWARD G. BUDD, of the city and county of Philadelphia, State of Pennsylvania,have invented an Improvement in Sheet-Metal Pulleys, of which the following is a specification.

My invention has reference to sheet-metal pulleys; and it consists of certain improvements which are fully set forth in the follownig specification and shown in the accompanying drawings, which form a part thereof.

In sheet-metal pulleys of the character illus trated in PatentNo. 595,559, dated December 14, 1897, there is at times trouble arising from a weakness between the spoke-arms and semicircular hub portions with which they are integrally formed when subjected to excessive torsional strains due to heavy loads being applied to the rim of the pulley. The construction of hub-clamp illustrated in said patent is adapted to directly clamp the semicircular portions upon the pulley-shaft, but does not in any manner brace or strengthen the spokearms to enable them to better resist the torsional strains exerted in the plane of revolution.

The object of my invention is to overcome these objections, and to'secure such results I employ a special type or character of hubclamp which while performing the function of clamping the pulley-sections upon the driving or driven shaft shall also brace the spokearms at a distance from the shaft and adjacent to the hub portions.

In carrying out my-invention I provide the sheet-metal pulley-rims and semicircular hub portions with box-shaped castings or forgings of a shape adapted to fit over the arms and surround the same, so as to brace them at a considerable distance from the shaft. These box-shaped sections may be riveted or otherwise secured to the semicircular hub portions of the spoke-arms. The two box-shaped clamping and bracing sections thus applied to the opposite halves of the split pulley are combined with suitable clam ping-bolts adapted to draw the two sections toward each other, and thereby clamp the hub of the pulley upon the shaft. The action of drawing the two sections toward each other. also more posi; tively clamps the box-shaped sections upon arms 0.

the spoke -arms and enables them to more fully withstand torsional strains. The clamping-bolts may be two or more in number and either arranged between the two sets of spoke- 5 5 arms or upon the outer sides of said spokearms, as preferred. The box-shaped sections are so shaped at portions adapted to receive the spoke-arms that properly-formed sockets are thereby produced which brace the spoke- 6o arms both in the plane of rotation and transversely as well.

My improvements will be better understood by reference to the accompanying drawings, in which- 6 Figure 1 is an elevation of the central portion of a pulley embodying my invention, the rim portions and outer ends of the spoke-arms being broken away. Fig. 2'is a plan view of same. Fig. 3 is a vertical section through the clamping box-shaped sections and also indicating the upper set of spoke-arms in po sition. Fig. 4 is a side elevation of a complete pulley. Fig. 5 is a similar view to Fig.

1, showing the clamping-bolts arranged be tween the two sets of spoke-arms. Fig. 6 is a similar view to Fig. 3, showing the modified arrangement of the clamping-bolts, andFig.

7 is a similar View to Fig. 2 with the modified arrangement of the clamping-bolts.

A is the rim of the pulley and is formed of sheet metal with an internal flange, to which the outer ends of the spoke-arms O O are riveted. The two semicircular sections of the rim of the split pulley are clamped together by the rim-clamps J J. Each half of the pulley is provided with metal spoke-arms O and two sets of oppositely-directed oblique These spoke-arms of each set converge adjacent to the shaft-bearing and unite in an integral semicircular hub portion D, substantially as illustrated in the aforesaid patent, to which reference has been made. The two sets of spoke-arms of one-half the pulley are separated at a greater distance at the hub end than at the outer end, where they converge and are riveted to the rim, as is clearly indicated in Fig. 3.

E is a reinforcing box-shaped section formed of either cast or forged metal. cast metal, it may be of malleable iron or cast-steel, as desired. The particular metal If formed of 00 is immaterial so long as it has the requisite stlength. The box-shaped clamping-section E has an inner curvature to correspond to the curvature of the semicircular hub portion D and has lateral flanges K, which extend outward from each side of the spoke-arms and which may be riveted or otherwise secured to the semicircular hub portions D by rivets passing through the flanges K, as at c. In this manner both of the semicircular hub portions D of the two sets of spoke-arms are held at the proper distance apart adjacent to the hub; but, if desired, these two parts may be secured to a semicircular bearing-plate arranged within them, as indicated in the aforesaid patent. In such case the rivets e might be omitted, although it is preferable to permanently connect the sections E with the parts D D. The middle portion of the section E has an upwardly-extending socket structure F, which is formed with an aperture F, corresponding to the two outer sides of the middle spoke-arms C, so as to fit snugly to them, as indicated in Figs. 2 and 3. This socket is connected in the direction of the outer spoke-arms O to additional U-shaped sockets H, having apertures II of a shape to fit down over the oblique arms 0 and to act as a brace to said arms when any pressureis directed upon them and toward the arms 0. The sockets F and H are further braced by intervening ribs 11, connecting them at their outer ends. The box-shaped section having these sockets is preferably made hollow in the central portions between the flanges K for the purpose of making it exceedingly light in weight, while maintaining great strength or rigidity. In practice it is customary to form the ribs 0 upon the spoke-arms; but this is not essential.

The portions of the box-shaped connections E on each side of the sockets H are extended at i to form seats for the bolts I, which pass through and are adapted to unite the two oppositely-arranged sections E E for clamping them upon the shaft. I have shown four of these bolts I, the same being arranged in pairs in the plane of revolution of the semicircular hub portions of the spoke arms, though it is not essential that four of these clamping-bolts shall be used.

It will be observed that in my improved construction herein illustrated the semicircular hub-flanges D may directly grip the shaft; but, if desired, a suitable bushing may be inserted, preferably of the split form, to suit shafts of difierent diameters and of less diameter than that formed by the said semicircular hub portions. Any strains put upon the spoke-arms in the plane of rotation will be directly transmitted to the clamping and bracing box-sections E at a distance from the union of the said spoke-arms with the semicircular portions, and consequently there will be greatly less danger to rupture and shearing, which is an important consideration in pulleys employed on heavy machinery.

The construction shown in Figs. 5, G, and 7 corresponds in all material respects with the construction shown in Figs. 1 to 4, the only diiference being that in place of using four bolts I and arranging them outside of the spoke-arms I have shown the use of two clamping-bolts I and these arranged so as to pass through the space between the opposite sets of spoke-arms. The general construction of the clamping-section E is the same; but the part h of the construction of Figs. 1 and 2 is made somewhat wider, so as to form a suitable support for the bolts. The sections E have lateral flanges, as in the first-mentioned case, and are riveted at e to the semicircular flanges or hub portions D of the spoke-arms.

It willbe observed that in the patent hereinbefore referred to the two semicircular hub portions D corresponding to one-half of the wheel are shown as connected to an internal hub-shell which is directly received upon the shaft or upon an internal bushing and is necessary for the purpose of holding the inner ends of the spoke-arms at the proper distance apart. It will be observed in the construction set out in this application that this inner shell may be used as indicated in dotted lines at R or dispensed with and the reinforcing-sections E, which are arranged upon the outside, relied upon to perform the same function, as desired. When the shells R are used, the sections E need not be riveted to the hub portions.

The wallsfof the socket portion F are inclined to correspond with the inclination of the spoke-arms, as is clearly shown, so that the outer ends of the sockets firmly fit to the faces of the spokes, as indicated in the various figures.

I do not confine myself to any special configuration of the sections E, as my invention comprehends, broadly, a box-shaped section which fits over the spoke-arms and braces them at a short distance from the hub and at the same time acting as the clamps for holding the split hub of the pulley firmly upon the shaft. Therefore while I prefer the construction herein shown as excellently adapted to the purpose, I do not confine myself to the minor details.

Having now described my invention, what I claim as new, and desire to secure by Letters Patent, is-- 1. In a pulley the combination of two sets of spoke-arms terminating at their inner ends in semicircular hub portions, combined with two semicircular box-shaped hub-sections each formed of one piece and having sockets through which the spoke-arms pass and snugly fit the cross-bars of the sections fitting between the adjacent spokes and by which they are directly braced and in which said sections directly fit upon the outside of the semicircular hub portions of the spoke-arms.

2. In a pulley the combination of two sets of spoke-arms terminating at their inner ends in semicircular hub portions, combined with two semicircular box-shaped sections each having side frames and cross connectingbars forming sockets through which the spokearms pass and snugly fit and by which they are directly braced and in which said sections fit upon the outside of the semicircular hub portions of the spoke-arms and secured thereto to hold them in pairs at proper distances apart and further provided with bolt-holes through which clamping-bolts may pass to draw the two semicircular box-shaped sections toward each other.

3. In a pulley the combination of the spokearms forming two oppositely-directed structures terminating in semicircular hub portions, with clamping and reinforcing sections respectively tightly fitted upon the outer sides of the semicircular hub portions andhaving sockets through which the spoke-arms snugly pass and by which they are directly braced, and clamping-bolts for drawing the two clamping and reinforcing sections toward each other.

4. In apulley the combination of the spokearms 0 0 arranged in pairs as shown, and terminating in semicircular hub-sections D D, with a clamping and bracing section E having a central'socket F and side sockets H adapted to receive the spoke arms and in which the socket F is inclosed on all sides and the socket H open upon one side.

5. 'In a pulley the combination of the spokearms 0 0' arranged in pairs as shown and terminating in semicircular hub-sections D D, with a clamping and bracing section E having sockets F H as set out adapted to receive the spoke-arms, and in which the socket F is central and inclosed on all sides and the sockets H open upon one side, and suitable means for rigidly connecting the clampingsection E to the semicircular hub portions.

6. In a pulley the combination of a series of spokes radiating from a common semicircular hub portion with which they are integrally formed, with a semicircular clamping and bracing section extending upon both sides of the spoke-arms having apertures or socket portions through which the spokes pass provided with walls or edges at their outer parts shaped to conform to the edges or surfaces of the spoke-arms, whereby said spoke-arms are directly braced and supported against torsional strains by said clamping and bracing section.

7. The combination of two sets of spokearms terminating in semicircular hub portions, with an externally-arranged semicircular bracing-section fitted to the outer parts of said hub portions and extending transversely between the spoke-arms and directly supporting them, and means for rigidly connecting the said hub portions to the bracing-section whereby said hub portions are held in alinement and at a proper distance apart and the spokes directly braced.

S. The combination of two sets of spokearms corresponding to one-half of the wheel, each set having the arms thereof terminating in a semicircular hub portion adjacent to the axis of the wheel, with an externally-arranged bracing-section fitted to the outer parts of said hub portions and extend-ing between the spoke-arms, means for rigidly connecting the said hub portions to the bracing section whereby said hub portions are held in alinement and at a proper distance apart, a second and similar set of spoke-arms and bracing-section opposed to the first-mentioned set, and clamping-bolts extending between the two bracing-sections for drawing them together with the semicircular hub-sections to tightly grasp the shaft.

9. In a half-section of apulley the combination of spoke-arms terminating in oppositelydirected semicircular flanges or hub portions, with a clamping and bracing section made with a semicircular bearing to fit down upon the simicircular hub portions or flanges of the spoke-arms and provided with transverse portions which extend between the spoke-arms and-directly support and brace the same at a distance from the semicircular flanges or hub portions.

10. A hub-clamp for sheet-metal pulleys consisting of a box-shaped structure having its inner surface curved to approximately correspond to the diameter of the shaft or bushing upon which the pulley is to be clamped, and having its outer portions provided with a centrally=surrounded socket F and two lateral sockets H H open on their sides farthest from the central socket.

11. A hub-clamp for sheet-metal pulleys consisting of a box-shaped structure having its inner surface cur'ved to approximately correspond to the diameter of the shaft or bushing upon which the pulley is to be clamped, and having its outer portionsprovided with a centrally-surrounded socket F and two lateral sockets H H open on their sides farthest from the central socket, and further provided with bolt'holes arranged adjacent to the last-mentioned sockets, and upon opposite sides of the curved inner portion.

In testimony of which invention I have hereunto set my hand.

EDWARD G. BUDD.

Witnesses:

CHARLES A. BRINLEY, FRANK G. GRIER. 

